Shen Jen

Title: Innovations by Inventor Shen Jen

Introduction

Shen Jen is a notable inventor based in Richardson, TX (US). He has made significant contributions to the field of magnetic recording systems, holding 2 patents that showcase his innovative approach to servo control systems.

Latest Patents

One of Shen Jen's latest patents is titled "Servo control system using servo pattern time of flight for read/write." This invention presents an improved servo control system for data track following in magnetic recording systems. It utilizes a pattern of segments of servo information slanted across the data tracks. The time of flight of the servo segment from the occurrence of a reference pulse until the peak servo signal is read by the head indicates the position of the head in a direction perpendicular to the desired track. This time is compared with the known time of flight if the head were precisely over the centerline of the desired track, generating a control signal to position the head accurately.

Another significant patent is "Servo control system using a varying frequency servo pattern." This invention enhances magnetic recording disk drives, particularly flexible disk drives. It features a head positioning servo system that utilizes servo information recorded on the disk. The servo information is located within one of the data sectors and consists of a pattern of radially spaced-apart segments. Each segment overlaps multiple data tracks and comprises magnetic transitions that increase in frequency radially, providing a digital head position error signal (PES). This system ensures reliable PES at all radial locations on the disk, allowing for the interchangeability of disks among different disk drives.

Career Highlights

Shen Jen is currently employed at International Business Machines Corporation (IBM), where he continues to innovate in the field of data storage technology. His work has significantly impacted the efficiency and reliability of magnetic recording systems.

Collaborations

Throughout his career, Shen has collaborated with notable colleagues, including William John Kabelac and Ian L Sanders. These collaborations have contributed to the advancement of technology in their respective fields.

Conclusion

Shen Jen's contributions to the field of magnetic recording systems through his innovative patents demonstrate his expertise and commitment to advancing technology. His work at IBM and collaborations with esteemed colleagues further highlight his impact on the industry.